Alternate counterparts of the Doctor's TARDIS existed in other realities.
Parallel universes[[edit] | [edit source]]
Earth-33⅓[[edit] | [edit source]]
- Main article: The Doctor's TARDIS (Earth-33⅓)
to be added
Martha loses her Osterhagen key[[edit] | [edit source]]
A version of the TARDIS existed in one parallel universe in which Martha Jones lost her Osterhagen key. (PROSE: "What If... Martha lost her Osterhagen key?" [+]Part of Time Warped!, Loading...{"namedpart":"What If... Martha lost her Osterhagen key?","1":"Time Warped! (DWA 90 feature)"})